Can you please provide me with the trouble code for a GMC Sierra with the code po449?

The P0449 error code in the GMC Sierra indicates a malfunction with the Evaporative Emission Vent Valve Solenoid. This code is triggered when the vehicle's diagnostic system detects a leak in the emissions system due to abnormal data received from the solenoid by the ECM. Reasons for this issue may involve a loose gas cap, damaged or improperly connected vacuum hoses, faulty purge or vent solenoids, or a non-functioning EVAP vent solenoid requiring replacement. This error code can also arise if the EVAP canister becomes fuel-soaked and fails to adequately clean emissions. Additionally, loose wiring, connections, or lines in the Sierra's fuel delivery system near the tank or gas cap can contribute to the problem. Drivers may notice an illuminated "check engine" light and detect the smell of fuel fumes.